Ballsscrew support help

[routercnc]

So I had a bearing starting to make a noise on the Y so rather than leave it, I got onto it and change both bearings.

But something isn't right as the new ones make a horrible grinding/squeeking noise from day one with zero hours use on them. I assumed I had put things back wrong.

Got some new bearings, took things to bits and replaced them again, making sure I didn't damage anything and putting everything back correctly.

But again from day one they are making the same horrible grinding/squeezing noise.

Is there some special method of installing bearings or ball screw support that im not aware of? Im clearly doing something wrong

Does it vary with speed? Steppers can emit squealing noises at different speeds (usually low speeds) and this travels down the ballscrew and can sound like it is coming from the bearings. Steppers are driven by pulses so this can happen as a result. Do you have a recording you can upload?